CA1137541A - Surge voltage arrestor with ventsafe feature - Google Patents
Surge voltage arrestor with ventsafe featureInfo
- Publication number
- CA1137541A CA1137541A CA000344135A CA344135A CA1137541A CA 1137541 A CA1137541 A CA 1137541A CA 000344135 A CA000344135 A CA 000344135A CA 344135 A CA344135 A CA 344135A CA 1137541 A CA1137541 A CA 1137541A
- Authority
- CA
- Canada
- Prior art keywords
- electrode
- arrester
- gas tube
- air gap
- electrodes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T1/00—Details of spark gaps
- H01T1/14—Means structurally associated with spark gap for protecting it against overload or for disconnecting it in case of failure
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
SURGE VOLTAGE ARRESTER WITH VENTSAFE FEATURE
Abstract of the Disclosure A surge voltage arrester assembly for protecting telephone lines comprises a primary gas tube surge arrester and an air gap secondary arrester that provides surge pro-tection should the gas tube become vented to atmosphere.
The secondary arrester has the air gap defined by a rim of one of the gas tube electrodes and a metallic cup into which the gas tube is positioned. In a three element version of the invention wherein the gas tube has two line electrodes and a ground electrode, metallic cups are provided at opposite ends of the gas tube to cooperate with the ground electrode for forming secondary air gaps for each line electrodes. An O-ring and a sealing compound seals each secondary air gap against the entrance of contaminants.
Abstract of the Disclosure A surge voltage arrester assembly for protecting telephone lines comprises a primary gas tube surge arrester and an air gap secondary arrester that provides surge pro-tection should the gas tube become vented to atmosphere.
The secondary arrester has the air gap defined by a rim of one of the gas tube electrodes and a metallic cup into which the gas tube is positioned. In a three element version of the invention wherein the gas tube has two line electrodes and a ground electrode, metallic cups are provided at opposite ends of the gas tube to cooperate with the ground electrode for forming secondary air gaps for each line electrodes. An O-ring and a sealing compound seals each secondary air gap against the entrance of contaminants.
Description
1~37S'~
Back round of the Invention - ~ .
This invention relates to improvements surge voltage arresters for line protectors of the type used for protecting telephone lines and like communication lines from over-voltage and over-current conditions.
Surge voltage arrester of the cold cathode gas discharge tube type serve as the primary arrester and source of protection in various line protectors. Such line protec-tors may also include a carbon or other type of air gap back-up protector in the event of a failure of the primary surge arrester as a result of leakage of gas from the tube due to a broken seal or similar damage. A gas tube arrester which has failed in this manner will be difficult to detect because the line to which it is connected continues to operate properly. Thus, it is desirable to provide some type of air gap or secondary surge arrester as a "back-up" or vent safe feature in the event of failure of the gas tube arrester~
Line protectors embodying these surge voltage arresters are frequently installed under conditions wherein dust, moisture and other contaminants can enter the secondary air gap. This can alter the breakdown voltage characteristics of the air gap and possibly reduce its reliability.
Summary of the Invent~on An object of this invention is to provide an improved surge voltage arrester assembly that utilizes a gas tube as a primary surge arrester and a sealed air gap 3 75~
or secondary surge arrester in the e~ent of leakage failure of the gas tube. The assembly may have either a two electrode or a three electrode gas tube.
A further object of this invention is to provide an arrester assembly which is compact and economical, and which may be embodied into known types of station pro~
tectors or central office protectors.
The surge voltage arrester assembly, whether of the two or three electrode type, has a primary surge arrester of the cold cathode gas tube type and a secondary~ -arrester of the air gap type. The breakdown voltage of ~-the secondary arrester is great-er than the breakdown voltage of the primary arrester. The arresters are housed~ ~
together and adapted to be connected to form parallel ~ ;
electric circuits from a line to be protected to ground.
The secondary arrester has its air gap defined by an annular portion of a metallic cup that contains the gas tube and by the rim of an electrode that forms part of the gas tube.
The air gap is annular in configuration. Means are provided for sealing the gas tube in the cup so as to prevent con-taminants from entering the air gap. The sealing means include8 an annular pliable ring interposed between the electrode and the aforesaid annular portion, and there are means forming an annular groove for receiving said ring.
This pliable ring may be of an elastomeric composi-tion. Furthermore, the sealing means may include a sealing 113~5~
compound over a part of the ring and sealing against the electrode and the annular portion.
In a three electrode version of the invention there is a first or ground electrode, and second and third or line electrodes at opposite ends of the firs~ or ground electrodes. The electrodes are sealed together and insulated from each other 80 that there îs a primary arc gap in the tube between each of the line electrodes and the ground electrode. The means forming eachsecondary or back-up air gap external to the gas tube ~ defined by a rim of the ground electrode and a surrounding cylindrical cup that receives a line electrode and part of the ground electrode. The seal for the secondary air gap comprises a pliable elastomeric ring between the cup and the ground electrode. A sealing compound is preferably applied in the space between the cup and the ground electrode.
rlef Description of the Drawings -FIG. 1 is a sectional view of a surge voltage arrester assembly of the present invention and shown embodied in a known type of line protector;
FIG. 2 is a fragmentary sectional view on an enlarged scale taken along line 2-2 of FIG. l;
FIG. 3 is an enlarged fragmentary portion of FIG.
l; and FIG. 4 illustrates a three element gas tube form of the invention and with the section line taken along the .
~13'75 longitudinal axis of the tube.
Detailed Description Referring now to the drawing there is shown a station protector 10 embodying a surge voltage arrester assembly of the invention. The protector comprises sheet metal housing or cap 12 having an annular sidewall portion 14 containing an annular flange or stop-shoulder 16. Below the shoulder 16, the sidewall 14 is formed with a screw thread 18 for threading into the well 61 of a protector block 62, as will be presently more fully described. The cap 12 also in-cludes an end wall 20 which is opposite to the open end of the cap 12.
- Mounted within the cap 12 are several coaxial parts which provide the primary and secondary surge arrester assembly of the invention. More specifically, there is a gas tube 22 having opposed electrodes 24,~6 that define an arc gap 28 therebetween. The electrodes 24, 26 are separated by a tubular insulator 30 of ceramic or the like to which the electrodes 24, 26 are brazed or soldered in the usual manner. Thus, the electrodes respectively have annular electrode flanges 32, 34 at which the electrodes 24, 26 are silver soldered to the ends of the insulator 30 by rings 27.
The gas tube 22 is coaxially housed within a tubular ' structure that is in the form uf a metallic cup 36 having a cylindrical sidewall 38. The gas tube 22 fits closely within the confines of the cup 36 although the gas tube and parts /
.
assembled therewith may slide ré~ative to the cup so as to facilitate assembly of those parts.
; Near the open end of the cup 36 the sidewall 38 has diametrally enlarged annular cylindrical end portion 40 which surrounds the peripheral edge of the electrode flange 34. This end portion 40 defining the open end of the cup 36 is radially spaced from the electrode flange 34 and from an adjacent part sf the insulator 30 so as to define a secondary air gap 42 of annular configuration.
The electrode flange 34 has a metal contact there-against formed by two coaxial cylindrical sections 47, 49 of successively smaller diameters. The larger diameter section 47 forms with the adjacent end surface of the flange 34 a groove ~ç 51 for receiving an annular O-ring 53. The O-ring 53 is of pliable material, preferably an elastomer, for example silicone rubber, although other elastomers might also be suitable. The O-ring is of a width such that it substantially spans the gap between the section 47 and the end portion 40. A sealing com-pound 55 may, if necessary, be disposed over the O-ring 53 and seals against a portion thereof. The compound 5S, which may also be a silicone, is applied against the end portion 40 and the surfaces of the sections 47, 49. As a result, the secondary air gap 42 is sealed against contaminants.
The metallic cup 36 is coaxially housed within a metallic grounding cage 50 having an end wall 52 and a plural-ity of circum~erentially spaced, spring-like fingers 54. The ~ spring fingers are compressed radially inwardly when the cup !~ -- 6 ., ~ 7~
36, together with the arrester assembly, are inserted as a unit within the open end of the cup sidewall 14. In this regard a solder pellet 56 is inserted into the cage 50 prior to insertion of the assembled cup and gas tube so that the solder pellet lies between the end wall of the cup 36 and the end wall 52 of the cage 50. A coil compression spring 58 bears at one end on the end wall 20 and at its opposite - end against the flat end wall 52 of the grounding cage, During assembly of the protector, the sealing ring 53 and the sealing compound 55 prevent the gas tube 22 from coming out of the cup 36. The arcuate tips 60 of the spring fingers 54 apply inward pressure against the cylindrical cup end portion 40, The protector 10 is adapted to be mounted in the well 61 of the dielectric block or receptacle 62. This block, which is of known construction, has a metallic contact member 64 with an internal thread as shown for receiving the cap thread 18. This contact member 64 is usually connected to ground.
At the bottom of the well 61 is a metallic contact 66 which is electrically connected to the electrode 26 through its ~~ ~~~
section 49. Contact 66 is connected to the line to be protected. In threading the protector 10 into the ground contact member 64 to the limit of the stop-shoulder 16, the extreme end of the section 49 will firmly engage the line contact 66 by reason of the force of the spring 58.
The arc gaps 28 and 42 are electrically coupled in parallel circuits from the line contact 66 to the ground contact 64. The width o t~e arc gap 42 is such that its ~ 1 3~5 ~1 breakdown voltage is greater than ~hat of the breakdown volt-age across the arc gap 28 of the gas tube 223 Consequently, when the gas tube arrester is operating properly as a pri-mary surge arrester an over-voltage on the line to be protected will result in a discharge across the gas tube arc gap 28 to ground, The secondary surge arrester will not discharge across the air gap 42, However, if the gas tube should fail due to-leakage, some protection will be afforded by a discharge to ground across the air gap 42 even though the breakdown voltage thereacross is somewhat higher than the breakdown voltage across the gas tube when the latter is functioning normally.
In an overcurrent condition on the line due, for example, to a prolonged voltage above the arcing voltage of the gas tube, the heat within the protector 10 will cause the solder pellet 56 to melt whereupon the force of the spring 58 will press the tips 60 of the grounding cage into direct metallic contact with the line contact 66. This results Ln a direct metallic connection of the line to be protected from the line contact 66 to the ground contact member 64, A three element gas tube version of the arrester assembly is shown in Fig. 4, The primary or gas tube surge arrester comprises opposed line electrodes 70, 70 and a center . or ground electrode 72, The several electrodes are insulated from each other by ceramic insulators 74, 74 which are soldered by rings 76 to the respective electrodes, The center or ground electrode 72 is hollow to provide communicating coaxial cavities 77, 77 that receive 8tem portions 78, 78 ~1 375 4~
of the line electrodes 70, 70. The stem portions 7~, 78 co-operate with the ground electrode to provide primary arc gaps 79, 79 from each line electrode to ground.
A secondary air gap is also provided between each line electrode 70 and the ground electrode 72. A metallic cup 80~ similar to cup 36~ receives and contacts a line elec-trode such that the open ends of the cups 80, 80 face each other. Each cup has a cylindrical sidewall 81 with a diametrally enlarged annular cylindrical end portion 82 that is spaced from a rim 84 of the ground electrode 72 to provide an annular secondary air gap 86.
The sealing arrangement for each air gap 86 also utilizes a pliable elastomeric annular O-ring 88 and a sealing compound 90. The O-ring fits into an annular groove 92 in the ground electrode and is sized to engage the end portion 82. The sealing compound 90 is disposed in a second annular groove 94 in the ground electrode 72 and seals agains~ that electrode as well as against the O-ring 88 and the end portion 82.
The CUp8 80, 80 may be sized to fit into a clip type receptacle for respective connections to the two sides of the telephone line to be protected. The center electrode may receive a clip or other connector in the region between the two bands of sealing compound 90, 90. Other conventional mountings for the gas tube may be made as it is essentially cylindrical in configuration and so lends itself to ready adaptation to known mountings.
~, , ,, _ q 1~ 375 41 As in Figs~ 1-3, the primary arc gaps 79, 79 have breakdown voltages less than that of the secondary air gaps 86, 86 except when the gas tube becomes vented, in which case the air gaps have the lower breakdown voltage. As ~ result "vent-safe" protection is provided for each side of thP pro-tected line.
Back round of the Invention - ~ .
This invention relates to improvements surge voltage arresters for line protectors of the type used for protecting telephone lines and like communication lines from over-voltage and over-current conditions.
Surge voltage arrester of the cold cathode gas discharge tube type serve as the primary arrester and source of protection in various line protectors. Such line protec-tors may also include a carbon or other type of air gap back-up protector in the event of a failure of the primary surge arrester as a result of leakage of gas from the tube due to a broken seal or similar damage. A gas tube arrester which has failed in this manner will be difficult to detect because the line to which it is connected continues to operate properly. Thus, it is desirable to provide some type of air gap or secondary surge arrester as a "back-up" or vent safe feature in the event of failure of the gas tube arrester~
Line protectors embodying these surge voltage arresters are frequently installed under conditions wherein dust, moisture and other contaminants can enter the secondary air gap. This can alter the breakdown voltage characteristics of the air gap and possibly reduce its reliability.
Summary of the Invent~on An object of this invention is to provide an improved surge voltage arrester assembly that utilizes a gas tube as a primary surge arrester and a sealed air gap 3 75~
or secondary surge arrester in the e~ent of leakage failure of the gas tube. The assembly may have either a two electrode or a three electrode gas tube.
A further object of this invention is to provide an arrester assembly which is compact and economical, and which may be embodied into known types of station pro~
tectors or central office protectors.
The surge voltage arrester assembly, whether of the two or three electrode type, has a primary surge arrester of the cold cathode gas tube type and a secondary~ -arrester of the air gap type. The breakdown voltage of ~-the secondary arrester is great-er than the breakdown voltage of the primary arrester. The arresters are housed~ ~
together and adapted to be connected to form parallel ~ ;
electric circuits from a line to be protected to ground.
The secondary arrester has its air gap defined by an annular portion of a metallic cup that contains the gas tube and by the rim of an electrode that forms part of the gas tube.
The air gap is annular in configuration. Means are provided for sealing the gas tube in the cup so as to prevent con-taminants from entering the air gap. The sealing means include8 an annular pliable ring interposed between the electrode and the aforesaid annular portion, and there are means forming an annular groove for receiving said ring.
This pliable ring may be of an elastomeric composi-tion. Furthermore, the sealing means may include a sealing 113~5~
compound over a part of the ring and sealing against the electrode and the annular portion.
In a three electrode version of the invention there is a first or ground electrode, and second and third or line electrodes at opposite ends of the firs~ or ground electrodes. The electrodes are sealed together and insulated from each other 80 that there îs a primary arc gap in the tube between each of the line electrodes and the ground electrode. The means forming eachsecondary or back-up air gap external to the gas tube ~ defined by a rim of the ground electrode and a surrounding cylindrical cup that receives a line electrode and part of the ground electrode. The seal for the secondary air gap comprises a pliable elastomeric ring between the cup and the ground electrode. A sealing compound is preferably applied in the space between the cup and the ground electrode.
rlef Description of the Drawings -FIG. 1 is a sectional view of a surge voltage arrester assembly of the present invention and shown embodied in a known type of line protector;
FIG. 2 is a fragmentary sectional view on an enlarged scale taken along line 2-2 of FIG. l;
FIG. 3 is an enlarged fragmentary portion of FIG.
l; and FIG. 4 illustrates a three element gas tube form of the invention and with the section line taken along the .
~13'75 longitudinal axis of the tube.
Detailed Description Referring now to the drawing there is shown a station protector 10 embodying a surge voltage arrester assembly of the invention. The protector comprises sheet metal housing or cap 12 having an annular sidewall portion 14 containing an annular flange or stop-shoulder 16. Below the shoulder 16, the sidewall 14 is formed with a screw thread 18 for threading into the well 61 of a protector block 62, as will be presently more fully described. The cap 12 also in-cludes an end wall 20 which is opposite to the open end of the cap 12.
- Mounted within the cap 12 are several coaxial parts which provide the primary and secondary surge arrester assembly of the invention. More specifically, there is a gas tube 22 having opposed electrodes 24,~6 that define an arc gap 28 therebetween. The electrodes 24, 26 are separated by a tubular insulator 30 of ceramic or the like to which the electrodes 24, 26 are brazed or soldered in the usual manner. Thus, the electrodes respectively have annular electrode flanges 32, 34 at which the electrodes 24, 26 are silver soldered to the ends of the insulator 30 by rings 27.
The gas tube 22 is coaxially housed within a tubular ' structure that is in the form uf a metallic cup 36 having a cylindrical sidewall 38. The gas tube 22 fits closely within the confines of the cup 36 although the gas tube and parts /
.
assembled therewith may slide ré~ative to the cup so as to facilitate assembly of those parts.
; Near the open end of the cup 36 the sidewall 38 has diametrally enlarged annular cylindrical end portion 40 which surrounds the peripheral edge of the electrode flange 34. This end portion 40 defining the open end of the cup 36 is radially spaced from the electrode flange 34 and from an adjacent part sf the insulator 30 so as to define a secondary air gap 42 of annular configuration.
The electrode flange 34 has a metal contact there-against formed by two coaxial cylindrical sections 47, 49 of successively smaller diameters. The larger diameter section 47 forms with the adjacent end surface of the flange 34 a groove ~ç 51 for receiving an annular O-ring 53. The O-ring 53 is of pliable material, preferably an elastomer, for example silicone rubber, although other elastomers might also be suitable. The O-ring is of a width such that it substantially spans the gap between the section 47 and the end portion 40. A sealing com-pound 55 may, if necessary, be disposed over the O-ring 53 and seals against a portion thereof. The compound 5S, which may also be a silicone, is applied against the end portion 40 and the surfaces of the sections 47, 49. As a result, the secondary air gap 42 is sealed against contaminants.
The metallic cup 36 is coaxially housed within a metallic grounding cage 50 having an end wall 52 and a plural-ity of circum~erentially spaced, spring-like fingers 54. The ~ spring fingers are compressed radially inwardly when the cup !~ -- 6 ., ~ 7~
36, together with the arrester assembly, are inserted as a unit within the open end of the cup sidewall 14. In this regard a solder pellet 56 is inserted into the cage 50 prior to insertion of the assembled cup and gas tube so that the solder pellet lies between the end wall of the cup 36 and the end wall 52 of the cage 50. A coil compression spring 58 bears at one end on the end wall 20 and at its opposite - end against the flat end wall 52 of the grounding cage, During assembly of the protector, the sealing ring 53 and the sealing compound 55 prevent the gas tube 22 from coming out of the cup 36. The arcuate tips 60 of the spring fingers 54 apply inward pressure against the cylindrical cup end portion 40, The protector 10 is adapted to be mounted in the well 61 of the dielectric block or receptacle 62. This block, which is of known construction, has a metallic contact member 64 with an internal thread as shown for receiving the cap thread 18. This contact member 64 is usually connected to ground.
At the bottom of the well 61 is a metallic contact 66 which is electrically connected to the electrode 26 through its ~~ ~~~
section 49. Contact 66 is connected to the line to be protected. In threading the protector 10 into the ground contact member 64 to the limit of the stop-shoulder 16, the extreme end of the section 49 will firmly engage the line contact 66 by reason of the force of the spring 58.
The arc gaps 28 and 42 are electrically coupled in parallel circuits from the line contact 66 to the ground contact 64. The width o t~e arc gap 42 is such that its ~ 1 3~5 ~1 breakdown voltage is greater than ~hat of the breakdown volt-age across the arc gap 28 of the gas tube 223 Consequently, when the gas tube arrester is operating properly as a pri-mary surge arrester an over-voltage on the line to be protected will result in a discharge across the gas tube arc gap 28 to ground, The secondary surge arrester will not discharge across the air gap 42, However, if the gas tube should fail due to-leakage, some protection will be afforded by a discharge to ground across the air gap 42 even though the breakdown voltage thereacross is somewhat higher than the breakdown voltage across the gas tube when the latter is functioning normally.
In an overcurrent condition on the line due, for example, to a prolonged voltage above the arcing voltage of the gas tube, the heat within the protector 10 will cause the solder pellet 56 to melt whereupon the force of the spring 58 will press the tips 60 of the grounding cage into direct metallic contact with the line contact 66. This results Ln a direct metallic connection of the line to be protected from the line contact 66 to the ground contact member 64, A three element gas tube version of the arrester assembly is shown in Fig. 4, The primary or gas tube surge arrester comprises opposed line electrodes 70, 70 and a center . or ground electrode 72, The several electrodes are insulated from each other by ceramic insulators 74, 74 which are soldered by rings 76 to the respective electrodes, The center or ground electrode 72 is hollow to provide communicating coaxial cavities 77, 77 that receive 8tem portions 78, 78 ~1 375 4~
of the line electrodes 70, 70. The stem portions 7~, 78 co-operate with the ground electrode to provide primary arc gaps 79, 79 from each line electrode to ground.
A secondary air gap is also provided between each line electrode 70 and the ground electrode 72. A metallic cup 80~ similar to cup 36~ receives and contacts a line elec-trode such that the open ends of the cups 80, 80 face each other. Each cup has a cylindrical sidewall 81 with a diametrally enlarged annular cylindrical end portion 82 that is spaced from a rim 84 of the ground electrode 72 to provide an annular secondary air gap 86.
The sealing arrangement for each air gap 86 also utilizes a pliable elastomeric annular O-ring 88 and a sealing compound 90. The O-ring fits into an annular groove 92 in the ground electrode and is sized to engage the end portion 82. The sealing compound 90 is disposed in a second annular groove 94 in the ground electrode 72 and seals agains~ that electrode as well as against the O-ring 88 and the end portion 82.
The CUp8 80, 80 may be sized to fit into a clip type receptacle for respective connections to the two sides of the telephone line to be protected. The center electrode may receive a clip or other connector in the region between the two bands of sealing compound 90, 90. Other conventional mountings for the gas tube may be made as it is essentially cylindrical in configuration and so lends itself to ready adaptation to known mountings.
~, , ,, _ q 1~ 375 41 As in Figs~ 1-3, the primary arc gaps 79, 79 have breakdown voltages less than that of the secondary air gaps 86, 86 except when the gas tube becomes vented, in which case the air gaps have the lower breakdown voltage. As ~ result "vent-safe" protection is provided for each side of thP pro-tected line.
Claims (8)
1. A surge voltage arrester assembly having a primary surge arrester of the cold cathode gas tube type and a secondary surge arrester of the air gap type, the breakdown voltage of the secondary arrester being greater than the breakdown voltage of the primary arrester, said arresters being housed together and being adapted to be connected to form parallel electric circuits from a line to be protected to ground, said secondary arrester having its air gap defined by an annular portion of a metallic cup that contains said gas tube and a rim of an electrode that forms part of said gas tube, said air gap being annular in config-uration, means sealing said gas tube in said cup to prevent contaminants from entering said air gap, said sealing means including an annular pliable ring interposed between said electrode and said annular portion, and means forming an annular groove for receiving said ring.
2. A surge voltage arrester assembly according to claim 1 in which said sealing means further includes a sealing compound over part of said ring and sealing against said elec-trode and said annular portion.
3. A surge voltage arrester assembly according to claim 1 or claim 2 in which a contact engages said electrode and projects through said ring.
4. A surge voltage arrester assembly according to claim 1 in which said electrode is hollow, there being also a second electrode having a portion within said first-mentioned electrode, a third electrode also within said first-mentioned electrode and forming a discharge gap therebetween, means forming an additional annular secondary air gap arrester with said third electrode, and means forming a seal to prevent contaminants from entering the air gap of said additional secondary air gap arrester.
5. A surge voltage arrester assembly comprising a first electrode, second and third electrodes at opposite ends respectively of said first electrode, said electrodes being sealed together and insulated from each other to form a sealed gas tube in which there is a primary arc gap in the tube between each of said second and third electrodes and said first electrode, and means forming secondary arc gaps external of the gas tube and between said first electrode and each of said second and third electrodes, each said secondary arc gap being of the air gap type and having a breakdown voltage greater than the breakdown voltage of either primary arc gap but having a breakdown voltage less than that of each primary arc gap should the gas tube become vented to atmosphere, each secondary arc gap being defined by a rim portion of said first electrode and a surrounding cylindrical element that is in electrical contact with one of said second and third electrodes, and means forming a seal to prevent contaminants from entering each said secondary arc gap.
6. A surge voltage arrester assembly according to claim 5 in which said means forming the seal comprises a ring between said cylindrical element and said first electrode.
7. A surge voltage arrester assembly according to claim 6 in which said ring is seated in a groove in said first electrode, and a sealing compound is disposed over part of said ring and is sealed to said cylindrical element and to said first electrode.
8. A surge voltage arrester assembly according to claim 5 in which said cylindrical element for each secondary arc gap forms an end portion of a cup which defines an open end of that cup to receive the first electrode and one of the second and third electrodes, the open ends of the cups facing each other, and the means forming the seal for each secondary arc gap being disposed in the space between said first electrode and the adjacent part of the cylindrical element.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/007,363 US4241374A (en) | 1979-01-29 | 1979-01-29 | Surge voltage arrester with ventsafe feature |
| US7,363 | 1979-01-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1137541A true CA1137541A (en) | 1982-12-14 |
Family
ID=21725734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000344135A Expired CA1137541A (en) | 1979-01-29 | 1980-01-22 | Surge voltage arrestor with ventsafe feature |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4241374A (en) |
| EP (1) | EP0014543B1 (en) |
| JP (1) | JPS55102190A (en) |
| CA (1) | CA1137541A (en) |
| DE (1) | DE3062652D1 (en) |
Families Citing this family (35)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4321649A (en) * | 1979-07-05 | 1982-03-23 | Reliable Electric Company | Surge voltage arrester with ventsafe feature |
| DE3070613D1 (en) * | 1980-07-30 | 1985-06-13 | Reliance Electric Co | Surge voltage arrester with ventsafe feature |
| DE3042847A1 (en) * | 1980-11-13 | 1982-06-09 | Siemens AG, 1000 Berlin und 8000 München | GAS DISCHARGE SURGE PROTECTOR WITH CONCENTRICALLY ENCLOSING VERSION |
| DE3100924A1 (en) * | 1981-01-14 | 1982-08-05 | Siemens AG, 1000 Berlin und 8000 München | "GAS DISCHARGE SURGE ARRESTER" |
| JPS60116720U (en) * | 1983-12-12 | 1985-08-07 | 東北金属工業株式会社 | noise filter |
| US4680665A (en) * | 1985-12-03 | 1987-07-14 | Reliance Comm/Tec Corporation | Gas discharge arrester |
| US4736269A (en) * | 1986-12-19 | 1988-04-05 | American Telephone And Telegraph Company, At&T Technologies, Inc. | Voltage surge limiter with grounding assembly |
| US4878146A (en) * | 1988-04-29 | 1989-10-31 | Reliance Comm/Tec Corporation | Line protector |
| US5373413A (en) * | 1990-10-05 | 1994-12-13 | Siecor Puerto Rico, Inc. | Surge arrester having solid state switch |
| US5195015A (en) * | 1991-03-07 | 1993-03-16 | Reliance Comm/Tec Corporation | Line protector for a communications circuit |
| US5172296A (en) * | 1991-06-14 | 1992-12-15 | Relaince Comm/Tec Corporation | Solid state overvoltage protector assembly |
| US5227947A (en) * | 1991-09-12 | 1993-07-13 | Reliance Comm/Tec Corporation | Arrester assembly with sealed back-up air gap |
| US5341270A (en) * | 1992-10-14 | 1994-08-23 | Reliance Comm/Tec Corporation | Drop resistant cup-arrester assembly |
| US5500782A (en) * | 1993-10-29 | 1996-03-19 | Joslyn Electronic Systems Corporation | Hybrid surge protector |
| US5508873A (en) * | 1995-07-31 | 1996-04-16 | Joslyn Electronic Systems Corporation | Primary surge protector for broadband coaxial system |
| US5751533A (en) * | 1996-02-01 | 1998-05-12 | Reltec Corporation | Cup and diode assembly for overvoltage protectors and communications lines |
| US5910877A (en) * | 1997-11-17 | 1999-06-08 | Reltec Corporation | Line protector for a communication circuit |
| US6430020B1 (en) * | 1998-09-21 | 2002-08-06 | Tyco Electronics Corporation | Overvoltage protection device including wafer of varistor material |
| JP4319750B2 (en) | 2000-01-05 | 2009-08-26 | 新光電気工業株式会社 | Triode discharge tube |
| US6327129B1 (en) | 2000-01-14 | 2001-12-04 | Bourns, Inc. | Multi-stage surge protector with switch-grade fail-short mechanism |
| US6606232B1 (en) | 2002-03-28 | 2003-08-12 | Corning Cable Systems Llc | Failsafe surge protector having reduced part count |
| US7433169B2 (en) * | 2005-12-15 | 2008-10-07 | Raycap Corporation | Overvoltage protection devices including wafer of varistor material |
| US8743525B2 (en) | 2012-06-19 | 2014-06-03 | Raycap Intellectual Property, Ltd | Overvoltage protection devices including wafer of varistor material |
| US9906017B2 (en) | 2014-06-03 | 2018-02-27 | Ripd Research And Ip Development Ltd. | Modular overvoltage protection units |
| DE102016101728A1 (en) * | 2016-02-01 | 2017-08-03 | Epcos Ag | Arrester for protection against overvoltages |
| US10319545B2 (en) | 2016-11-30 | 2019-06-11 | Iskra Za{hacek over (s)}{hacek over (c)}ite d.o.o. | Surge protective device modules and DIN rail device systems including same |
| US10707678B2 (en) | 2016-12-23 | 2020-07-07 | Ripd Research And Ip Development Ltd. | Overvoltage protection device including multiple varistor wafers |
| US10447026B2 (en) | 2016-12-23 | 2019-10-15 | Ripd Ip Development Ltd | Devices for active overvoltage protection |
| US10340110B2 (en) | 2017-05-12 | 2019-07-02 | Raycap IP Development Ltd | Surge protective device modules including integral thermal disconnect mechanisms and methods including same |
| US10685767B2 (en) | 2017-09-14 | 2020-06-16 | Raycap IP Development Ltd | Surge protective device modules and systems including same |
| US11223200B2 (en) | 2018-07-26 | 2022-01-11 | Ripd Ip Development Ltd | Surge protective devices, circuits, modules and systems including same |
| CN108870213A (en) * | 2018-08-28 | 2018-11-23 | 浙江炬星照明有限公司 | A kind of super safe LED lamp of lightning surge 3000V |
| US11862967B2 (en) | 2021-09-13 | 2024-01-02 | Raycap, S.A. | Surge protective device assembly modules |
| US11723145B2 (en) | 2021-09-20 | 2023-08-08 | Raycap IP Development Ltd | PCB-mountable surge protective device modules and SPD circuit systems and methods including same |
| US11990745B2 (en) | 2022-01-12 | 2024-05-21 | Raycap IP Development Ltd | Methods and systems for remote monitoring of surge protective devices |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE6826C (en) * | R. WAGNER in Chemnitz | Innovations to circular shears | ||
| US3096461A (en) * | 1960-11-19 | 1963-07-02 | Asea Ab | Lightning arrester with resilient sealing lid |
| US3254181A (en) * | 1964-01-07 | 1966-05-31 | Bell Telephone Canada | Mounting having short circuit means for communication line protector |
| US3254179A (en) * | 1964-01-07 | 1966-05-31 | Northern Electric Co | Mounting for communication line protector |
| US3569786A (en) * | 1969-01-13 | 1971-03-09 | Sankosha Co Ltd | High voltage arrester |
| CH506196A (en) * | 1969-05-05 | 1971-04-15 | Siemens Ag | Surge arresters |
| DE2056526C3 (en) * | 1970-11-12 | 1978-05-11 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Surge arrester with a membrane that closes off the inside |
| US3755715A (en) * | 1972-10-11 | 1973-08-28 | Reliable Electric Co | Line protector having arrester and fail-safe circuit bypassing the arrester |
| US4002952A (en) * | 1975-04-25 | 1977-01-11 | Ceac Of Illinois, Inc. | Electric overvoltage arrester with carbon air gap and gas tube |
| US4056840A (en) * | 1976-05-12 | 1977-11-01 | Reliable Electric Company | Line protector for communications circuit |
| US4062054A (en) * | 1976-08-31 | 1977-12-06 | Tii Corporation | Multi-function fail-safe arrangements for overvoltage gas tubes |
| US4132915A (en) * | 1977-01-14 | 1979-01-02 | Joslyn Mfg. And Supply Co. | Spark gap protector |
-
1979
- 1979-01-29 US US06/007,363 patent/US4241374A/en not_active Expired - Lifetime
-
1980
- 1980-01-22 CA CA000344135A patent/CA1137541A/en not_active Expired
- 1980-01-24 DE DE8080300224T patent/DE3062652D1/en not_active Expired
- 1980-01-24 EP EP80300224A patent/EP0014543B1/en not_active Expired
- 1980-01-29 JP JP988680A patent/JPS55102190A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP0014543A1 (en) | 1980-08-20 |
| DE3062652D1 (en) | 1983-05-19 |
| US4241374A (en) | 1980-12-23 |
| EP0014543B1 (en) | 1983-04-13 |
| JPS55102190A (en) | 1980-08-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |